Class 10 Locknuts | McMaster-Carr

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Metric

	Thread Size Thread Size

	Thread Pitch Thread Pitch

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Locknut

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	Locking Type Locking Type


Nylon Insert	Serrations

Distorted Thread	Steel Insert

	Fastener Strength Grade/Class Fastener Strength Grade/Class	Show

Class 10

	Fastener Strength Grade/Class Fastener Strength Grade/Class	Hide

	Finish Finish

Black Phosphate

Black Ultra-Corrosion-
Resistant Coated

Zinc Plated

Zinc Yellow-Chromate Plated

	Material Material

Steel

	Hex Nut Profile Hex Nut Profile

	Standard

	Height Height

	Specifications Met Specifications Met

DIN

ISO

	Width Width

	Thread Direction Thread Direction

	Right Hand

	Thread Type Thread Type

Metric

	Thread Spacing Thread Spacing

Coarse

Fine

Extra Fine

	Drive Style Drive Style

	External Hex

	Insert Maximum Temperature Insert Maximum Temperature

220° F

250° F

	Thread Fit Thread Fit

Class 6H

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Flange Diameter Flange Diameter

	Flange Thickness Flange Thickness

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

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166 Products

About Nuts, Materials, and Finishes

Zinc-Plated Steel

Black Ultra-Corrosion-Resistant Coated Steel

A nylon insert keeps metric bolt threads from coming loose due to vibration, wear, and temperature swings. About 25% stronger than medium-strength steel locknuts, these nuts are made of high-strength, Class 10 steel. They're used in valves, pumps, suspension systems, and other high-stress parts. A zinc plating prevents rust in wet areas. Combine with Class 10.9 metric bolts, which have similar strength. All are reusable but lose holding power after each use.

Some of these locknuts meet ISO 10511 (formerly DIN 985) or ISO 7040 (formerly DIN 982), which are international standards for dimensions. The ISO standards are functionally equivalent to the DIN standards with slight differences in width, height, or tolerances.

For technical drawings and 3-D models, click on a part number.

Thread
Size	Pitch, mm	Wd., mm	Ht., mm	Insert Max. Temp., °F	Specifications Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel—Class 10
M4	0.7	7	5	220°	DIN 985, ISO 10511	100	000000000	000000
M5	0.8	8	5	220°	DIN 985, ISO 10511	100	000000000	00000
M6	1	10	6	220°	DIN 985, ISO 10511	100	000000000	00000
M6	1	10	8	220°	DIN 982, ISO 7040	50	000000000	00000
M8	1.25	13	8	220°	DIN 985, ISO 10511	50	000000000	00000
M8	1.25	13	9.5	220°	DIN 982, ISO 7040	25	000000000	0000
M10	1.5	17	10	220°	DIN 985, ISO 10511	25	000000000	00000
M10	1.5	17	11.5	220°	DIN 982, ISO 7040	25	000000000	00000
M12	1.75	19	12	220°	DIN 985, ISO 10511	10	000000000	00000
M12	1.75	19	14	220°	DIN 982, ISO 7040	10	000000000	0000
M14	2	22	14	220°	DIN 985, ISO 10511	10	000000000	00000
M14	2	22	16	220°	DIN 982, ISO 7040	10	000000000	00000
M16	2	24	16	220°	DIN 985, ISO 10511	10	000000000	00000
M16	2	24	18	220°	DIN 982, ISO 7040	5	000000000	0000
M18	2.5	27	18.5	220°	DIN 985, ISO 10511	5	000000000	00000
M18	2.5	27	20	220°	DIN 982, ISO 7040	5	000000000	00000
M20	2.5	30	20	220°	DIN 985, ISO 10511	5	000000000	00000
M20	2.5	30	22	220°	DIN 982, ISO 7040	1	000000000	0000
M22	2.5	32	22	220°	DIN 985, ISO 10511	1	000000000	0000
M24	3	36	24	220°	DIN 985, ISO 10511	1	000000000	0000
M24	3	36	28	220°	DIN 982, ISO 7040	1	000000000	0000
M27	3	41	27	220°	DIN 985, ISO 10511	1	000000000	00000
M30	3.5	46	30	220°	DIN 985, ISO 10511	1	000000000	00000
M33	3.5	50	33	220°	DIN 985, ISO 10511	1	000000000	00000
M36	4	55	36	220°	DIN 985, ISO 10511	1	000000000	00000
M39	4	60	39	220°	DIN 985, ISO 10511	1	000000000	00000
M42	4.5	65	42	220°	DIN 985, ISO 10511	1	000000000	00000
M45	5	75	48	220°	DIN 985, ISO 10511	1	000000000	00000
Black Ultra-Corrosion-Resistant Coated Steel—Class 10
M4	0.7	7	5	220°	DIN 985	5	000000000	0000
M5	0.8	8	5	220°	DIN 985	5	000000000	0000
M6	1	10	6	220°	DIN 985	5	000000000	0000
M8	1.25	13	8	220°	DIN 985	5	000000000	00000
M10	1.5	17	10	220°	DIN 985	5	000000000	00000
M12	1.75	19	12	220°	DIN 985	1	000000000	0000
M14	2	22	14	220°	DIN 985	1	000000000	0000

Metric Fine-Thread High-Strength Steel Nylon-Insert Locknuts—Class 10

These locknuts have a nylon insert that grips the bolt to resist loosening without damaging threads. They're reusable, but their holding power lessens with each use. They're about 25% stronger than medium-strength steel locknuts and comparable in strength to Class 10.9 bolts. A zinc plating provides corrosion resistance in wet environments.

For technical drawings and 3-D models, click on a part number.

Thread
Size	Pitch, mm	Wd., mm	Ht., mm	Insert Max. Temp., °F	Specifications Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel—Class 10
M8	1	13	8	220°	DIN 985, ISO 10511	10	000000000	000000
M10	1	17	10	220°	DIN 985	25	000000000	00000
M10	1.25	17	10	220°	DIN 985, ISO 10511	10	000000000	00000
M12	1.25	19	12	220°	DIN 985, ISO 10511	10	000000000	00000
M12	1.5	19	12	220°	DIN 985	10	000000000	00000
M12	1.5	19	12	220°	DIN 985, ISO 10511	10	000000000	00000
M14	1.5	22	14	220°	DIN 985, ISO 10511	5	000000000	00000
M16	1.5	24	16	220°	DIN 985, ISO 10511	1	000000000	0000
M18	1.5	27	18	220°	DIN 985, ISO 10511	1	000000000	0000
M20	1.5	30	20	220°	DIN 985, ISO 10511	1	000000000	0000
M20	2	30	20	220°	DIN 985, ISO 10511	1	000000000	00000
M22	1.5	32	22	220°	DIN 985, ISO 10511	1	000000000	00000
M24	1.5	36	24	220°	DIN 985, ISO 10511	1	000000000	00000
M24	2	36	24	220°	DIN 985, ISO 10511	1	000000000	00000
M30	2	46	30	220°	DIN 985, ISO 10511	1	000000000	00000
M36	2	55	36	220°	DIN 985, ISO 10511	1	000000000	00000
M36	3	55	36	220°	DIN 985, ISO 10511	1	000000000	00000

High-Strength Steel Top-Lock Distorted-Thread Locknuts

An irregularly shaped thread at the top of the nut grips the bolt for a stronger hold than nylon-insert locknuts. They thread on from the bottom of the nut, allowing more threads to engage the bolt before tightening for easier installation than center-lock distorted thread locknuts. The strength of the bolt should match the strength of the nut to prevent damaging threads. They're not reusable. Comparable in strength to Grade 8 bolts, they're about 25% stronger than medium-strength steel locknuts.

Black-phosphate, zinc-plated, and zinc yellow-chromate plated locknuts resist corrosion in wet environments.

For technical drawings and 3-D models, click on a part number.

Metric

Thread
Size	Pitch, mm	Wd., mm	Ht., mm	Pkg. Qty.		Pkg.
Black-Phosphate Steel—Class 10
M5	0.8	8	5.1	50	000000000	000000
M6	1	10	6	25	000000000	0000
M8	1	13	8	10	000000000	0000
M8	1.25	13	8	25	000000000	00000
M10	1.25	17	10	5	000000000	00000
M10	1.5	17	10	10	000000000	00000
M12	1.25	19	12	5	000000000	00000
M12	1.5	19	12	5	000000000	00000
M12	1.75	19	12	5	000000000	0000
M14	1.5	22	14	5	000000000	00000
M14	2	22	14	5	000000000	00000
M16	1.5	24	16	1	000000000	0000
M16	2	24	16	5	000000000	00000
M18	1.5	27	18	1	000000000	0000
M18	2.5	27	18	1	000000000	0000
M20	1.5	30	20	1	000000000	0000
M20	2.5	30	20	1	000000000	0000
M22	1.5	33	22	1	000000000	0000
M22	2.5	33	22	1	000000000	0000
M24	1.5	36	24	1	000000000	00000
M24	2	36	24	1	000000000	00000
M24	3	36	24	1	000000000	00000
Zinc-Plated Steel—Class 10
M5	0.8	8	5.1	100	000000000	0000
M6	1	10	6	100	000000000	00000
M8	1	13	8	50	000000000	00000
M8	1.25	13	8	50	000000000	0000
M10	1	17	10	25	000000000	00000
M10	1.25	17	10	10	000000000	00000
M10	1.5	17	10	25	000000000	00000
M12	1.25	19	12	25	000000000	00000
M12	1.5	19	12	10	000000000	00000
M12	1.75	19	12	25	000000000	00000
M14	1.5	22	14	10	000000000	0000
M14	2	22	14	10	000000000	0000
M16	1.5	24	16	10	000000000	00000
M16	2	24	16	10	000000000	0000
M18	1.5	27	18	5	000000000	0000
M18	2.5	27	18	5	000000000	0000
M20	1.5	30	20	5	000000000	00000
M20	2.5	30	20	5	000000000	00000
M22	1.5	32	22	5	000000000	00000
M22	2.5	32	22	5	000000000	00000
M24	1.5	36	24	1	000000000	0000
M24	2	36	24	1	000000000	00000
M24	3	36	24	1	000000000	0000
M27	3	41	27	1	000000000	0000
M30	2	46	30	1	000000000	0000
M30	3.5	46	30	1	000000000	0000

Thread
Size	Pitch, mm	Wd., mm	Ht., mm	Pkg. Qty.		Pkg.
Zinc Yellow-Chromate Plated Steel—Class 10
M6	1	10	6	100	000000000	000000
M8	1	13	8	10	000000000	0000
M8	1.25	13	8	50	000000000	00000
M10	1.25	17	10	10	000000000	0000
M10	1.5	17	10	25	000000000	00000
M12	1.25	19	12	5	000000000	00000
M12	1.5	19	12	5	000000000	00000
M12	1.75	19	12	10	000000000	0000
M14	1.5	22	14	5	000000000	00000
M14	2	22	14	10	000000000	0000
M16	1.5	24	16	1	000000000	0000
M16	2	24	16	10	000000000	00000
M18	1.5	27	18	1	000000000	0000
M18	2.5	27	18	5	000000000	00000
M20	1.5	30	20	1	000000000	0000
M20	2.5	30	20	5	000000000	00000
M22	1.5	33	22	1	000000000	0000
M24	1.5	36	24	1	000000000	00000
M24	2	36	24	1	000000000	00000
M24	3	36	24	1	000000000	0000

Metric High-Strength Steel Steel-Insert Locknuts for Extreme Vibration—Class 10

When installed, the steel insert in these metric locknuts grips the threads and lifts away from the nut body, isolating the insert from the nut’s load to resist spinoff caused by vibration. These locknuts are often used in shakers and vibrating equipment. The strength of the bolt should match the strength of the nut to prevent damaging threads. About 25% stronger than medium-strength steel locknuts, these nuts are made of high-strength, Class 10 steel.

For technical drawings and 3-D models, click on a part number.

Thread
Size	Pitch, mm	Wd., mm	Ht., mm		Each
Steel—Class 10
M12	1.75	19	12.5	000000000	00000
M16	2	24	17	000000000	0000
M24	3	36	25.2	000000000	00000
M24	3	41	29.8	000000000	00000
M27	3	41	29.2	000000000	00000
M30	3.5	46	28.4	000000000	00000
M30	3.5	50	37.1	000000000	00000
M36	4	55	40.2	000000000	00000

Metric High-Strength Steel Serrated Flange Locknuts—Class 10

Serrations grip the material surface instead of the threads for easy installation and mild vibration resistance. The flange distributes pressure where the nut meets the material surface, eliminating the need for a separate washer. They're about 25% stronger than medium-strength steel flange locknuts and comparable in strength to Class 10.9 bolts. Height includes the flange.

Zinc-plated steel flange locknuts resist corrosion in wet environments.

For technical drawings and 3-D models, click on a part number.

Thread				Flange
Size	Pitch, mm	Wd., mm	Ht., mm	Dia., mm	Thick., mm	Specifications Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel—Class 10
M5	0.8	8	5	11.8	1	DIN 6923	25	000000000	00000
M6	1	10	6	14.2	1.1	DIN 6923	50	000000000	00000
M8	1.25	13	8	17.9	1.2	DIN 6923	50	000000000	00000
M10	1.5	15	10	21.8	1.5	DIN 6923	25	000000000	00000
M12	1.75	18	12	26	1.8	DIN 6923	10	000000000	0000
M16	2	24	16	34.5	2.4	DIN 6923	5	000000000	00000
M20	2.5	30	20	42.8	3	DIN 6923	1	000000000	0000
Steel—Class 10
M5	0.8	8	5	11.8	1	DIN 6923	25	000000000	0000
M6	1	10	6	14.2	1.1	DIN 6923	50	000000000	00000
M8	1.25	13	8	17.9	1.2	DIN 6923	50	000000000	00000
M10	1.5	15	10	21.8	1.5	DIN 6923	25	000000000	00000
M12	1.75	18	12	26	1.8	DIN 6923	10	000000000	00000
M16	2	24	16	34.5	2.4	DIN 6923	5	000000000	00000
M20	2.5	30	20	42.8	3	DIN 6923	1	000000000	0000

Metric High-Strength Steel Nylon-Insert Flange Locknuts—Class 10

A nylon insert firmly grips threads to resist loosening and a flange distributes the load over a large area. They’re reusable, but their holding power lessens with each use. Made from Class 10 steel, they're about 25% stronger than medium-strength steel flange nuts and comparable in strength to Class 10.9 bolts. They have a zinc or zinc-yellow-chromate plating to resist corrosion in wet environments. Height includes the flange.

For technical drawings and 3-D models, click on a part number.

Thread				Flange
Size	Pitch, mm	Wd., mm	Ht., mm	Dia., mm	Thick., mm	Insert Max. Temp., °F	Specifications Met	Pkg. Qty.		Pkg.
Zinc Yellow-Chromate Plated Steel—Class 10
M6	1	10	9.1	14.2	1.1	250°	DIN 6926	50	000000000	000000
M8	1.25	13	11	17.9	1.2	250°	DIN 6926	50	000000000	00000
M10	1.5	15	13.5	21.8	1.5	250°	DIN 6926	25	000000000	00000
M12	1.75	18	16.1	26	1.8	250°	DIN 6926	25	000000000	00000
M14	2	21	18.2	29.9	2.1	250°	DIN 6926	10	000000000	00000
M16	2	24	20.3	34.5	2.4	250°	DIN 6926	5	000000000	00000
M20	2.5	30	24.8	42.8	3	250°	DIN 6926	1	000000000	0000
Zinc-Plated Steel—Class 10
M6	1	10	9.1	14.2	1.1	250°	DIN 6926	25	000000000	00000
M8	1.25	13	11.1	17.9	1.2	250°	DIN 6926	10	000000000	0000
M10	1.25	15	13.5	21.8	1.5	250°	DIN 6926	5	000000000	00000
M10	1.5	15	13.5	21.8	1.5	250°	DIN 6926	10	000000000	00000
M12	1.25	18	16.1	26	1.8	250°	DIN 6926	1	000000000	0000
M12	1.5	18	16.1	26	1.8	250°	DIN 6926	1	000000000	0000
M12	1.75	18	16.1	26	1.8	250°	DIN 6926	5	000000000	00000
M14	1.5	21	18.2	29.9	2.1	250°	DIN 6926	1	000000000	0000
M14	2	21	18.2	29.9	2.1	250°	DIN 6926	1	000000000	0000
M16	2	24	20.3	34.5	2.4	250°	DIN 6926	1	000000000	0000

Metric High-Strength Steel Distorted-Thread Flange Locknuts—Class 10

Grip metric bolts more securely than nylon-insert flange locknuts—the irregularly shaped threads on these locknuts hold extra tight. They resist vibration and sudden shocks, even after multiple uses. Thanks to their flange, these nuts distribute pressure across a greater area than standard nuts, so you don’t need to add a washer. However, they may not fit in tight spaces. Made of high-strength, Class 10 steel, these nuts are about 25% stronger than medium-strength steel flange nuts. Their strength is comparable to Class 10.9 bolts. A zinc plating protects the steel under it from rust, extending the life of the nut.

These flange nuts meet DIN and ISO dimensional standards that confirm their compatibility with other parts and tools. ISO 7044 is functionally equivalent to DIN 1664 (formerly DIN 6927).

For technical drawings and 3-D models, click on a part number.

Thread				Flange
Size	Pitch, mm	Wd., mm	Ht., mm	Dia., mm	Thick., mm	Specifications Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel—Class 10
M6	1	10	6	14.2	1.1	DIN 1664, DIN 6927, ISO 7044	50	0000000	000000
M8	1.25	13	8	17.9	1.2	DIN 1664, DIN 6927, ISO 7044	25	0000000	0000
M10	1.5	15	10	21.8	1.5	DIN 1664, DIN 6927, ISO 7044	10	0000000	0000
M12	1.75	18	12	26	1.8	DIN 1664, DIN 6927, ISO 7044	10	0000000	00000
M14	2	21	14	29.9	2.1	DIN 1664, DIN 6927, ISO 7044	5	0000000	00000
M16	2	24	16	34.5	2.4	DIN 1664, DIN 6927, ISO 7044	1	0000000	0000
M20	2.5	30	20	42.8	3	DIN 1664, DIN 6927, ISO 7044	1	0000000	0000

About Nuts, Materials, and Finishes

Metric High-Strength Steel Nylon-Insert Locknuts—Class 10

Metric Fine-Thread High-Strength Steel Nylon-Insert Locknuts—Class 10

High-Strength Steel Top-Lock Distorted-Thread Locknuts

Metric High-Strength Steel Steel-Insert Locknuts for Extreme Vibration—Class 10

Metric High-Strength Steel Serrated Flange Locknuts—Class 10

Metric High-Strength Steel Nylon-Insert Flange Locknuts—Class 10

Metric High-Strength Steel Distorted-Thread Flange Locknuts—Class 10